成果報告書詳細
管理番号20120000000821
タイトル*平成23年度中間年報 省エネルギー革新技術開発事業 先導研究 水処理汚泥を利用した水処理省エネルギー利用技術の研究開発
公開日2012/6/29
報告書年度2011 - 2011
委託先名オオブユニティ株式会社 学校法人中部大学 国立大学法人名古屋大学 国立大学法人岐阜大学
プロジェクト番号P09015
部署名省エネルギー部
和文要約本研究事業では下水処理場における省エネ化を実現するために,従来下水汚泥処理工程で消費されていた補助燃料や排ガス処理のために使用されていた脱硫用薬品(アルカリ剤)を必要としない新しい汚泥処理システムの開発を行うことを目的としている。そのため本研究開発においては補助燃料を使用することなく汚泥を脱水可能な堆肥化乾燥システムと汚泥の堆肥化と炭化を組み合わせた脱硫システムを融合した新しい汚泥処理プロセスを提案し、プロセス構築に必要な要素技術について実験的検討を行うとともに、省エネプロセス最適化に関するFSを実施した。
本研究においては、堆肥化、乾燥、炭化および脱硫など汚泥処理システム構築に必要な技術開発、および得られる炭化物の利用用途に関する研究開発に加えて汚泥処理システムの最適化に関するFS調査を行った。具体的には、(1)高速堆肥化技術に関する研究、(2)乾式脱硫脱臭技術に関する研究、(3)活性炭液製造技術に関する研究、(4)水処理利用技術に関する研究、(5)汚泥処理利用技術に関する研究、(6)高効率堆肥炭化工程における省エネ最適システム化に関する研究、および(7)炭化物の省エネ最適利用システムに関する研究、の7つの研究開発を実施し、平成23年度は以下の成果を得ている。
英文要約Title: Fundamental research projects for development of energy conservation and innovation technology for leading study on utilization technology of water treatment with energy conservation by using water-treatment sludge (FY2010-2012) FY2011 annual report
In this study, five of experimental study, which is 1. the study of high speed compositing system, 2. dry desulfurization system, 3. activated carbon liquid manufacturing, 4. water treatment utilization of carbonized sludge and 5. utilization of carbonized sludge, and two of feasibility study, which is 6. the study of optimum energy saving in new sludge treatment system and 7. optimum utilization of carbonized sludge, was conducted to establish newly proposed sludge treatment system. In the study of high speed composting system, composting test of sludge in lab.-scale and actual-scale composting machine was carried out, and drying test of sludge in laboratory was also conducted. By mixing sludge and carbonized sludge, composting speed increased with increasing the ratio of carbonized sludge. In the drying test, drying speed significantly increased with increased the mixing ratio of carbonized material as well. In the study of desulfurization system, adsorption and reaction experiment with NH3 and SO2 was conducted. Carbonized sludge was able to adsorb SO2. It was confirmed that (NH4)2SO4 was generated with NH3 and SO2, and produced NH3 and SO2 in sludge treatment process is stabilized as (NH4)2SO4. In the study of activated carbon liquid manufacturing, verification test of activated carbon liquid manufacturing was conducted, and manufacturing performance was confirmed. Although the energy saving effect increases with using fine carbonized sludge in the utilization process, choking problem and particle loss by flow out has to be solved for the actual application to improve the energy efficiency. As the application of carbonized sludge, adsorbent of organic material and bio-carrier water treatment system was considered. Therefore, in the study of utilization of carbonized sludge, adsorption performance of organic material and nitrification performance as bio-carrier was evaluated. It was clarified that carbonized sludge is capability of absorbing organic component, and nitrification performance of carbonized sludge was as good as commercial bio-carrier. In the study of utilization of activated carbon liquid, deodorizing verification test of activated carbon liquid was carried out in actual sludge treatment plant. By adding small amount of activated carbon liquid to the sludge, significant deodorizing effect was confirmed. In the study of optimum energy saving, carbonization experiment in rotary kiln type carbonizer was conducted to calculate energy balance of carbonization process. From the result, proposed energy saving sludge treatment system can be establish with even using high moisture content sludge of 80%. In the study of optimum carbonized sludge utilization, case study of proposed sludge treatment system in the aspect of process cost was carried out. From the result, 6950 JPY/ton-sludge treatment can be saved with the newly proposed sludge treatment system comparing with conventional type sludge treatment system.
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